ch1-exp: Log and color output

src/main.rs

@@ -3,24 +3,30 @@
 
 mod lang_items;
 mod sbi;
+mod logger;
 
 #[macro_use]
 mod console;
 
 use core::arch::global_asm;
+use log::{debug, error, info, trace, warn};
+
 global_asm!(include_str!("entry.asm"));
 
 #[no_mangle]
 pub fn rust_main() -> ! {
     clear_bss();
+    logger::init();
 
     sbi::console_write_byte('O' as u8);
     sbi::console_write_byte('K' as u8);
     sbi::console_write_byte('\n' as u8);
 
-    sbi::console_write("Hello World.\n".as_bytes());
-
-    println!("hello world from macro");
+    trace!("Hello World.");
+    debug!("Hello World.");
+    info!("Hello World.");
+    warn!("Hello World.");
+    error!("Hello World.");
 
     panic!("Shutdown machine!");
 }